Jmeter manual file upload Post request

Question

after strugelling for about a week to get an old ASP.net site to accept a multipart form Post request I finally got it to work with a bit of a work around the trick is that Jmeters multipart form functionallity wasnt working properly for this site, so now i have to write the Post request in the Body manually. But the problem is again on the upload file part. I am able to upload empy .txt files but i am unable to upload .png .jpeg i susspect that i am doing something wrong. I read on a site that i am supposed to use _FileToString somehow to upload an existing file but i have no idea how i am supposed to do that. Full POST request image

WebKitFormBoundaryBbo97BWEj5UehRpp Content-Disposition: form-data; name="ctl00$ContentPlaceHolder1$8$9$fu_appDocument$fu_document"; filename="StacktraceKnijki.png" Content-Type: image/png

Can someone help me turn this into a working upload file request? Thank you.

Answer 1

Why don't you just record the file upload request using JMeter's HTTP(S) Test Script Recorder? JMeter should be smart enough to produce the relevant HTTP Request sampler from the captured request.

The only pre-requisite is having your StacktraceKnijki.png file in JMeter's "bin" folder during the recording process, see Recording File Uploads with JMeter guide for more details.